Fluid-pressure bearing.



J. W. MACPARLANB. FLUID PRESSURE BEARING.

APPLICATION FILED DBc.1z,19o2.

N0 MODEL.

airs

Patented December 20, 19041.

JAMES VRIGHT MAOFARLANE, OF GLASGOW, SCOTLAND.

FLUlD-FRlESSURE EHlNGr..

SPECIFICATION forming part or' Letters Patent No. 777,682, dated December 20, 1904,

i Application filed December 12, 1902. Serial No. 134,961,

To (/,Zl 1,071,077?, zit may concern:

Beit known that 1', JAMES VRieI-I'r MAC- FARLANE, engineer, of the iirm oi' lflfatson, Laidlaw & Oo., of 98 Dundas street south, Glasgow, Scotland, have invented certain new and useful Improvements in Fluid-Pressure Bearings for the Vertical Shafts of Centrifugal and other Machines, oi'l which the following is a speciiication.

My invention relates to improvements in centrifugal machines or hydro-extractors in which oil or other suitable fluid under pressure is substituted for the ordinary7 footstepbearing, and has special reference to the oilpressure bearings for centrifugals described in Andreas Freitags application, Serial No. 88,866, and tiled January 8, 1902.

1n the construction of the spindle in the appli :ation referred to if the iluid-presslin'e exceeds the pressure of the machine it is intended to support the spindle may rise too iar in its bearings, and this circumstance demands some regulation of the pressure oi the oil which is forced into the spindle to maintain the weight oi' the machine, so that the rise of the spindle may be limited. A reference to Freitagsap plication will show that means are provided to allow the escape oi' the il uid and relieve the pressure when the spindle has been raised to a given position.

My improvement consists in providing a port or ports on the inlet or pressure side instead o'f escape side, which ports are opened and closed by the spindle as it Falls or rises in the same manner as is done in Freitags application. The advantage o'l' the ports being on the inlet side instead oi' on the escape side is that only the quantity of oil which required to maintain the spindle at the proper position will be admitted. 1i' the ports are on the escape side and the load in the revolvingl basket of the centril'ugal is such to require the escape-port kept open, an increased amount el: oil would have to be pumped to maintain the pressure in the volume of oil passing through the spindle.

As in Freitags application, 1 provide a port or ports to allow of the escape ot' any accumulation of pressure which might be caused. by leakage past the bushes or bearings of the spindle.

My invention is applicable to the bearings described in Freitags application. It is also applicable to any Huid-pressure bearing where a vertical spindle is revolved in parallel bearings, external or internal.

In order that my invention may be properly understood and readily carried into eil'ect, I have hereunto appended two sheets oiE drawings, of which-w Figures 1 and 2, being' vertical sections, show how the invention is carried out in the ease of centrifugals which have hollow spindles.

Referring to Figs. l and Q, the section marked Fig. l shows the relative positions of the outer and inner spindle when the oil-pre. sure is shut ofi", and in this relation the top pulley rests on the brake. 1V hen the oil-valve is opened and the oil admitted into the pres sure-chamber (l, as shown by arrows drawn in i'uil lines in Fig. 2, the outer spindle is raised. As the outer spindle rises it acts as a valvel and closes the inlet-port D, as shown in section Fig. 2, and the position at which it comes to rest is such that the leakage from pressureport l), due to clearances between the revolving parts, is just sui'licient to maintain the pressure in chamber O, which willsupport .the load. The effect orl this arrangement is to reduce the supply of oil required to a minimum. Should the leakage become great enough to increase the pressure in the chamber O beyond what is required to support the spindle and basket.v the outer spindle will rise still farther; but this increase of up ward movement is limited by the port E to prevent the possibility oi' too great an upward movement. As soon as the upward movement oil the spindle has uncoverr-nfl the portE direct communication is established between the oilpressure chamber and the oil-return port, thus allowing' the excess pressure to escape. The outer spindle will thereupon drop suiliciently to again cover the port E.

I elaimwith ports Controlling the flow of liquid to In a fluid-sustained spindle device for oenthe pistons, substantially as described. IO trii'ugal machines, the Combination of an outer In testimony whereof I have affixed my sigrevolving spindle, an inner stationary spindle, nature in presence of two witnesses. 5 annular piston-like parts between the spindles, JAMES WRIGHT MACFARLANE,

said stationary spindle having passages for Witnesses: admitting the uid between the pistons, and JOHN LIDDLE,

said inner and outer spindles being provided AGNES MAoKINTosH. 

